Stenciling machine



p 26, 1933- I. P. SIMONSEN El AL 1,928,234

STENCILING MACHINE Filed Nov. 3, 1931 2 Sheets-Sheet i Fig- 1 4 a Q 8'. 4- I o 2/ e 7 45 I O O 26 L v 1/ nv VENTURE Sept. 26, 1933. I, P, N HAL 1,928,234

STENCILING MACHINE Filed Nov. 3, 1931 2 Sheets-Sheet 2 INVENTUR'E Patented Sept. 1933 UNITED STATES PATENT OFFICE v STENCILING MACHINE p I Irving Percy Simonsen and Edwin JacObSenJLos I Angeles, Calif., assignors to Milo Murray Harding, Los Angeles, Calif.

Application November 3, 1931. Serial No. 572,764

4 Claims.

Our invention relates to stenciling machines wherein perfect registration is obtainable.

The primary object of our invention is to produce an automatic stenciling machine that is sim- .l ple in construction and that will give perfect registration under all conditions.

A further object of our invention is to produce an automatic stenciling machine that will give 7 perfect registration when the paper feed speed is substantially less than the drum surface speed.

A further object of our invention is to provide a positive means of stripping the sheet of paper from the drum without smearing the stenciled sheet of paper.

With these and incidental objects in view the invention consists in certain novel features of construction and combination of parts, a preferred form of embodiment of which is herein after shown with references to the drawings, which accompany and form a part of the specifications.

In the drawings: 7 Fig. 1 is a side elevation of my machine with a portion of the frame broken away to show the stop element.

Fig. 2 is a plan view of the drum removed from the machine.

Fig. 3 is a section of the paper gripper taken on line AA, Fig. 2.

Fig. 4 is'a plan view of the feed board removed from the machine. 7

Fig. 5 is an end elevation of the feed beers showing the trough end.

Fig. 6 is a fragmentary cross sectional view taken on line BB, Fig. 2.

Like reference characters refer to like parts throughout the several views.

The drum 1 is revolved in the frames 2 upon the shaft 3. The crank 4 is secured to one end of the shaft and the quadrant 5 is secured to the opposite end. The rubber feeder roll 6 which feeds the paper 7, is hinged to the link 8 which receives its motion from the quadrant 5 through the connecting link 9.

The drum 1 is freely disposedupon the shaft 3', a pair of flanges l0 arrest any lateral movement of the drum as they are pinned-to theshaft 3 by the pins 11. A pair of gripper arms 12 are freely journaled about the hub of the flanges 10 and are held in position by the collars 13. The screw 25 which is tapped into the flange 10 is provided to hold the drum securely between the two flanges 10. This arrangement allows the V drum to be placed in various positions in relation to the gripper bar and thus the printing on the sheets may be varied. The arms 12 are normally held against the stop pins 14, by the springs 15. The paper gripper 16 is secured to the arms 12 by the screws 17. A pair of runners 18 are slidably disposed upon the gripper 16, to accomno modate the various widths of paper.

The gripper bar 16 is formed into a channellike structure as shown in Fig. 3. This channel does not continue the full length of the gripper bar as the ends which are secured to the arms 12 are flat. The ends of the gripper barare offset to allow the channeled portion thereof to be pressed to the drum without distorting the metal.

Referring to Fig. 1, the sheet of paper 7 is fed into the gripper 16. It may be seen that as the drum rotation is in the direction of the arrow, the gripper arms 12 will not move until the drum has moved far enough to bring the drive pins 19 in contact with the arms 12. At this point the gripper 16 passes between the drum and the impression roll 20, thus collapsing the spring gripper about the end of the paper '7, thus the paper follows the gripper. As soon as the gripper has passed between the drum and roller, it immediately opens releasing the paper. As soon as the spring runner 18 passes the impression roll, it returns to its natural tangent position, thus separating the sheet. of paper from the drums surface. The strippers 21 are used to further direct the paper to its stack. It may be seen 8 that the spring loaded stops 22 overcome the tension of the springs 15, until the drive pins 19 overcome the spring loaded stops 20. When the runner 18 has passed the impression roll, the

charged springs 1'5 pull the arms 12 up to the stop 7 9 7 pins 14.

The paper is slightly cambered when it is fed into the gripper to insure a slight pressure against it at all times by the paper. We provide a shrouded feed board 23 having a trough 24. We provide the adjustment screws 25 for the stops 20.

. While the above mechanism herein shown and described is admirably adapted to fulfill the objects primarily stated, it is to be understood that it is not intended to confine the invention to the one form of embodiment herein shown and described as it is susceptible of embodiment in various forms, all coming within the scope of the claims which follow:

What we claim is:

1. In a stenciling machine a drum freely mounted upon a shaft, a flange secured to the shaft at each end of the drum, a screw for gripping the drum between the flanges, a pair of no gripper arms hinged upon the flanges, a drive and 1;

stop pin in each of the flanges, springs for normally holding arms against the stop pins, a spring gripper secured to the gripper arms, a pair of runners slidably disposed upon the gripper, a pair of spring loaded stops for communication with the gripper arms and a shrouded paper feed 4. In a stencilingmachine, in combination, a shaft, a drum mounted upon the shaft, a flange secured to the shaft at each end of the drum, a

screw for gripping the drum between the flanges, a pair of gripper arms hinged upon the flanges, a

pair of driving pins for driving the gripper arms,

a'pair of stop pins for limiting the free travel of the gripper arms, means for normally holding the gripper arms against the stop pins and spring v loaded stops for engagement with the gripper arms.

IRVING PERCY SIMONSEN.

EDWIN JACOBSEN.

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